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Employee - Summary of Status of Performance Share Plans and Related Changes (Detail) - Performance share plans [member]	12 Months Ended
	Dec. 31, 2017 shares € / shares	Dec. 31, 2016 shares € / shares	Dec. 31, 2015 shares € / shares
Disclosure of share based compensation plans [Line Items]
Outstanding at 1 January	14,818,060	15,979,140	17,468,291
Awarded	4,962,345	7,016,274	8,890,394
Vested	(4,723,861)	(6,983,053)	(8,448,454)
Forfeited	(1,371,797)	(1,194,301)	(1,931,091)
Outstanding at 31 December	13,684,747	14,818,060	15,979,140
Fair value per share award during the year | € / shares	€ 42.59	€ 35.43	€ 33.17

X

- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

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-Name IFRS
-Number 2
-IssueDate 2016-01-13
-Paragraph 47
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-URIDate 2016-03-31

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- Definition

The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

+ References

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-Number 2
-IssueDate 2016-01-13
-Paragraph 45
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- Definition

The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

+ References

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-Name IFRS
-Number 2
-IssueDate 2016-01-13
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45&doctype=Standard
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- Definition

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

+ References

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- Definition

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- Definition

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